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沁中南正断层附近煤储层压力分布特征研究

Study on Distribution Characteristics of Coal Reservoir Pressure near NormalFault in Central Shizhuang South Block of Qinshui Basin

  • 摘要: 查明断层附近煤储层压力分布特征能为煤层气井位布置提供重要依据。以沁水盆地中部柿庄南区块典型正断层为研究对象,采用煤层气井排采动液面计算储层压力的方法,得出正断层附近煤储层压力分布特征。采用测井和实验室渗透率—排驱压力测试法,分析了断层附近围岩封盖性和煤层的煤体结构对储层压力变化的影响。研究结果表明:正断层附近700 m内,煤储层压力随与断层距离的增加呈指数型增加;超过700 m范围,储层压力受断层的影响较小。在断层影响范围内,距断层不同位置的煤体结构变化大是引起储层压力变化大的主控因素。该研究成果可为正断层附近煤层气井的布置提供参考。

     

    Abstract: To find out the distribution characteristics of coal reservoir pressure near the fault can provide an important basis for the CBM well layoutt. In this paper the typical normal faults in the central Shizhuang south block of Qinshui Basin were taken as the research object, the CBM drainage dynamic liquid level was used to calculate the reservoir pressure, and the distribution characteristics of the reservoir pressure near the normal fault was thus obtained. Through the logging and permeability-displacement pressure test in the lab, analysis was carried out on the influence of the sealing property of the surrounding rock near the fault and the coal seam structure upon the change of the reservoir pressure. The results showed that the coal reservoir pressure in the 700 m range near the normal fault increased exponentially with the increase of the fault distance; over the 700 m range, the reservoir pressure was less affected by the fault. In the influence range of the fault, the main controlling factors for the change of the reservoir pressure were the great change of the coal bodies in different distance to the fault. The research results can provide reference for the CBM well layout near the normal fault.

     

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